The effectiveness of Jacquard Color Remover or iDye Color Remover (or any other thiourea dioxide product) will depend on the particular colorant used on the fabric. Pigments won't remove at all and dyes will either:1.) Remove nearly all the way.2.) Remove most of the way.3.) Remove to a completely different color.4.) Not remove at all.

The reason for the wide range of results is because some dye colors are "immune" to the chemical, while others are not.

Color removers work best with hot water (stove top method)-just like the Jacquard Acid dyes that you may have used when previously dyeing wool. Because of the temperature, shrinkage is going to be a concern and so is felting. It will be important to raise and lower the temperature slowly and stir gently to reduce the likelihood that this will occur.